:root {
            /* --- 核心主题色 --- */
            --primary-color: #4a90e2;
            --primary-dark: #357abd;
            
            /* --- 选项颜色 & 列表状态颜色 --- */
            --success-color: #d1fae5;  
            --success-text: #065f46;
            --success-pill: #10b981; 
            
            --error-color: #fee2e2;
            --error-text: #991b1b;
            --error-pill: #ef4444;
            
            --partial-bg: #fef3c7;
            --partial-text: #92400e;
            --partial-pill: #f59e0b; 

            /* --- 基础 UI 颜色 --- */
            --text-color: #333;
            --sub-text-color: #666;
            --bg-color: #f3f4f6;
            --card-bg: #ffffff;
            --border-color: #eee;
            --shadow-color: rgba(0,0,0,0.08);
            
            --highlight-bg: #e0f2fe;
            --highlight-text: #0284c7;

            /* --- 解析框颜色 --- */
            --exp-bg: #f8f9fa;
            --exp-border: #e9ecef;
            --exp-title: #495057;

            /* --- 开关组件颜色 --- */
            --toggle-bg-off: #e5e7eb;    
            --toggle-on-bg: #34d399;     
            --toggle-text-active: #059669; 
            
            --header-height: 60px;
            --footer-height: 70px;
            
            /* --- 滚动条颜色 --- */
            --scrollbar-thumb: rgba(0, 0, 0, 0.15);
            --scrollbar-thumb-hover: rgba(0, 0, 0, 0.25);
            
            /* --- 搜索高亮颜色 --- */
            --search-match-bg: #fef08a;
            --search-match-text: #854d0e;
            --search-active-bg: #f59e0b;
            --search-active-text: #ffffff;

            /* --- 字体缩放基准 --- */
            --base-font-size: 15px;
            --font-scale: 1; 

            /* --- iOS Safari 视口和安全区域 --- */
            --safe-top: env(safe-area-inset-top);
            --safe-bottom: env(safe-area-inset-bottom);
            
            /* JS 动态写入 */
            --vh: 100vh;
        }

        html.is-wechat {
            --safe-bottom: 0px !important; 
        }

        [data-theme="dark"] {
            --primary-color: #3A3A3A;
            --primary-dark: #505050;

            --text-color: #E5E5E5;
            --sub-text-color: #A0A0A0;
            --bg-color: #121212;
            --card-bg: #1C1C1C;

            --border-color: #2A2A2A;
            --shadow-color: rgba(0, 0, 0, 0.6);

            --highlight-bg: #2B2B2B;
            --highlight-text: #DDDDDD;

            --success-color: #142017;  
            --success-text: #7BCF93;
            --success-pill: #34d399;

            --error-color: #241516;
            --error-text: #D28888;
            --error-pill: #f87171;
            
            --partial-bg: #262015;
            --partial-text: #D6B47A;
            --partial-pill: #fbbf24;

            --exp-bg: #252525;
            --exp-border: #333;
            --exp-title: #aaa;

            --toggle-bg-off: #2C2C2C;  
            --toggle-on-bg: #2e7d56;   
            --toggle-text-active: #7BCF93;
            
            --scrollbar-thumb: rgba(255, 255, 255, 0.2);
            --scrollbar-thumb-hover: rgba(255, 255, 255, 0.3);
            
            --search-match-bg: #634d1b;
            --search-match-text: #e2e8f0;
            --search-active-bg: #d97706;
            --search-active-text: #ffffff;
        }

        /* 1. 全局基础设置 */
        mjx-container {
            font-size: 0.94em;
            font-weight: normal !important;
            font-style: normal !important;
            
            /* 保持 inline-block 以支持宽高控制 */
            display: inline-block !important; 
            
            /* 【关键修改】改为 middle，强制所有公式（无论长短）相对于文字垂直居中 */
            vertical-align: middle !important;
            /* 【关键修改】使用相对定位进行视觉补偿 */
            position: relative !important;
            top: -1.4px !important; /* 向上微调 2px，如果还不够可以改为 -3px */
            /* 滚动相关设置保持不变 */
            max-width: 100% !important;
            overflow-x: auto !important;
            overflow-y: hidden;
            
            margin: 0 1px !important;
            padding: 0 !important;
            
            box-sizing: border-box;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }

        /* 2. 针对【独立公式】($$...$$) 的特殊处理 */
        mjx-container[display="true"] {
            display: flex !important;
            width: 100% !important;
            justify-content: center; /* 居中 */
            margin: 1em 0 !important;
            padding: 0 !important; /* 独立公式通常不需要左右 padding */
        }

        /* 3. SVG 行为强制约束 */
        mjx-container svg {
            /* 使用 block 消除 SVG 自身的行内间距 */
            display: block !important; 
            fill: currentColor !important;
            max-width: none !important;
            flex-shrink: 0;
        }

        /* 4. 针对【行内公式】的微调 */
        mjx-container[display="false"] {
            /* 确保容器紧贴内容 */
            width: fit-content !important; 
        }
        /* --- PC端滚动条样式美化 --- */
        ::-webkit-scrollbar { width: 6px; height: 6px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 10px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }

        * { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

        /* 全局防溢出 */
        html, 
        body {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            height: var(--vh); /* 关键 */
            overflow: hidden;

            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-color);
            transition: background-color 0.3s, color 0.3s;
        }

        /* --- Header --- */
        header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;

            height: calc(var(--header-height) + var(--safe-top));
            padding-top: var(--safe-top);
            padding: 0 15px;

            background: var(--card-bg);

            z-index: 100;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-shrink: 0;
            transition: background-color 0.3s;
        }

        .icon-btn {
            background: none; border: none; font-size: 1.5em; cursor: pointer; padding: 8px;
            color: var(--text-color); border-radius: 50%; transition: background 0.2s;
            display: flex; align-items: center; justify-content: center; z-index: 52;
            width: 40px; height: 40px;
        }
        .icon-btn:active { background-color: var(--border-color); }
        
        .header-title-btn {
            position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
            max-width: 60%;
            background: none; border: none; 
            padding: 8px 12px; border-radius: 12px;
            cursor: pointer; z-index: 51;
            display: flex; flex-direction: column; align-items: center; justify-content: center;
            transition: background-color 0.2s;
        }
        .header-title-btn:active { background-color: var(--border-color); }
        
        .header-filename {
            font-size: 17px; font-weight: 600; margin: 0; white-space: nowrap;
            overflow: hidden; text-overflow: ellipsis; max-width: 100%;
            color: var(--text-color); line-height: 1.2;
        }
        
        .header-subtitle {
            font-size: 10px; color: var(--sub-text-color); font-weight: normal; margin-top: 2px;
            display: flex; align-items: center; gap: 4px;
        }
        .dot-indicator { width: 6px; height: 6px; border-radius: 50%; display: inline-block; }
        .dot-green { background-color: var(--success-pill); }
        .dot-yellow { background-color: var(--partial-pill); }
        .dot-red { background-color: var(--error-pill); }
        .stats-divider { margin: 0 2px; opacity: 0.3; font-size: 0.9em; }

        /* --- 抽屉与遮罩 --- */
        .drawer-mask {
            position: fixed; left: 0; width: 100%; background: rgba(0,0,0,0.3);
            backdrop-filter: blur(4px); opacity: 0; pointer-events: none; transition: opacity 0.3s ease;
        }
        .drawer-mask.active { opacity: 1; pointer-events: auto; }

        #file-drawer-mask, #settings-drawer-mask, #stats-drawer-mask { top: var(--header-height); height: calc(100% - var(--header-height)); z-index: 90; }
        #question-drawer-mask, #toc-drawer-mask { top: 0; height: 100%; z-index: 100; }

        .drawer-panel {
            position: fixed; top: var(--header-height); left: 0; width: 100%; background: var(--card-bg);
            z-index: 90; border-radius: 0 0 20px 20px; box-shadow: 0 10px 20px rgba(0,0,0,0.05);
            overflow: hidden; 
            transform: translateY(-110%); transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
            display: flex; flex-direction: column; max-height: 70vh;
        }
        .drawer-panel.active { transform: translateY(0); }

        .drawer-scroll-content { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding: 0; background: var(--card-bg); }

        .drawer-header-row {
            padding: 15px 20px; border-bottom: 1px solid var(--border-color); 
            font-weight:600; text-align:center; position: relative;
            display: flex; align-items: center; justify-content: center; gap: 6px;
        }

        /* --- Tooltip 样式 --- */
        .info-icon {
            width: 18px; height: 18px; border-radius: 50%; 
            border: 1.5px solid var(--sub-text-color); color: var(--sub-text-color);
            font-size: 12px; font-weight: bold; font-family: sans-serif;
            display: flex; align-items: center; justify-content: center;
            cursor: pointer; opacity: 0.6; transition: opacity 0.2s;
        }
        .info-icon:hover, .info-icon:active { opacity: 1; color: var(--primary-color); border-color: var(--primary-color); }

        .tooltip-popover {
            position: absolute; top: 40px; left: 50%; transform: translateX(-50%) translateY(10px);
            width: 290px; padding: 15px; background: var(--bg-color); 
            border: 1px solid var(--border-color); border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.15);
            font-size: 13px; color: var(--sub-text-color); line-height: 1.6; text-align: left;
            opacity: 0; pointer-events: none; transition: opacity 0.2s, transform 0.2s; z-index: 100;
        }
        .tooltip-popover.active { opacity: 1; pointer-events: auto; transform: translateX(-50%) translateY(0); }
        .tooltip-popover::before {
            content: ''; position: absolute; top: -6px; left: 50%; transform: translateX(-50%);
            border-left: 6px solid transparent; border-right: 6px solid transparent;
            border-bottom: 6px solid var(--border-color);
        }
        [data-theme="dark"] .tooltip-popover { background: #252525; border-color: #333; }
        [data-theme="dark"] .tooltip-popover::before { border-bottom-color: #333; }

        /* --- 底部题目列表 --- */
        .bottom-drawer {
            position: fixed; bottom: 0; left: 0; width: 100%; height: 80vh; background: var(--card-bg);
            z-index: 105; border-radius: 24px 24px 0 0; box-shadow: 0 -5px 30px rgba(0,0,0,0.15);
            transform: translateY(110%); transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1);
            display: flex; flex-direction: column;
        }
        .bottom-drawer.active { transform: translateY(0); }
        
        .bottom-drawer-header { padding: 10px 20px 15px 20px; border-bottom: 1px solid var(--border-color); flex-shrink: 0; text-align: center; position: relative; }
        .drawer-handle { width: 40px; height: 5px; background: var(--border-color); border-radius: 10px; margin: 0 auto 15px auto; opacity: 0.8; margin-bottom: 0px; }
        .bottom-drawer-title { font-size: 16px; font-weight: 600; color: var(--text-color); display: flex; justify-content: space-between; align-items: center; }
        .btn-drawer-close { background: var(--bg-color); border: none; width: 28px; height: 28px; border-radius: 50%; color: var(--sub-text-color); font-size: 16px; display: flex; align-items: center; justify-content: center; cursor: pointer; padding-top: 5px; padding-bottom: 6px; padding-left: 6px;}

        .bottom-drawer-body { flex: 1; overflow-y: auto; -webkit-overflow-scrolling: touch; padding: 15px; padding-top: 10px; background: var(--bg-color); overscroll-behavior-y: contain; }
        
        .list-end-footer {
            padding: 5px 0 5px 0; text-align: center; font-size: 12px; color: var(--sub-text-color); opacity: 0.6;
            display: flex; align-items: center; justify-content: center; gap: 12px; user-select: none;
        }
        .list-end-footer::before, .list-end-footer::after { content: ''; display: block; width: 30px; height: 1px; background-color: var(--border-color); }

        /* --- 题目列表项 --- */
        .q-item {
            position: relative; display: flex; align-items: center; padding: 14px 16px; margin-bottom: 10px;
            background: var(--card-bg); border-radius: 12px; cursor: pointer; transition: transform 0.1s, background-color 0.2s;
            border: 1px solid transparent; box-shadow: 0 1px 2px rgba(0,0,0,0.03); overflow: visible;
        }
        .q-item:active { transform: scale(0.985); background-color: var(--bg-color); }
        .q-item::before {
            content: ''; position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
            width: 4px; height: 18px; border-radius: 4px; background-color: var(--border-color);
            transition: background-color 0.3s, height 0.3s;
        }
        .q-item-content { display: flex; align-items: center; width: 100%; padding-left: 22px; }
        .q-text { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; line-height: 1.5; color: var(--text-color); font-size: 15px; font-family: 'Roboto Mono', monospace; }
        
        .q-item.answered::before { background-color: var(--success-pill); height: 24px; }
        .q-item.wrong::before { background-color: var(--error-pill); height: 24px; }
        .q-item.partial::before { background-color: var(--partial-pill); height: 24px; }
        .q-item.current { border-color: var(--primary-color); box-shadow: 0 4px 12px var(--shadow-color); z-index: 2; }
        .q-item.current:not(.answered):not(.wrong):not(.partial)::before { background-color: var(--primary-color); height: 24px; }
        .q-item.current .q-text { font-weight: 600; color: var(--text-color); }

        /* --- 目录(TOC) 样式 --- */
        .toc-item {
            padding: 12px 16px; margin-bottom: 6px; cursor: pointer;
            border-radius: 8px; color: var(--text-color); font-size: 14px;
            transition: background 0.2s, color 0.2s;
            white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
        }
        .toc-item:active { background: var(--border-color); }
        .toc-item.active {
            background-color: var(--primary-color);
            color: var(--card-bg); 
            font-weight: 700;
        }
        .toc-item.active.toc-h1,
        .toc-item.active.toc-h2,
        .toc-item.active.toc-h3,
        .toc-item.active.toc-h4,
        .toc-item.active.toc-h5,
        .toc-item.active.toc-h6 {
            color: #fbfbfb;
        }

        .toc-h1 { font-weight: 700; }
        .toc-h2 { padding-left: 30px; }
        .toc-h3 { padding-left: 45px; font-size: 13px; color: var(--sub-text-color); }
        .toc-h4 { padding-left: 60px; font-size: 13px; color: var(--sub-text-color); }
        .toc-h5 { padding-left: 75px; font-size: 13px; color: var(--sub-text-color); }
        .toc-h6 { padding-left: 90px; font-size: 13px; color: var(--sub-text-color); }

        /* --- 文件/设置 UI --- */
        .upload-area { padding: 20px 20px; padding-bottom: 20px; background: var(--card-bg); border-top: 1px solid var(--border-color); flex-shrink: 0; }
        .btn-upload-redesign {
            width: 100%; display: flex; align-items: center; justify-content: center; gap: 10px;
            background: var(--highlight-bg); color: var(--highlight-text); padding: 14px;
            border-radius: 12px; font-size: 15px; font-weight: 600; cursor: pointer; border: none; transition: all 0.2s;
        }
        .btn-upload-redesign:active { transform: scale(0.98); opacity: 0.8; }
        
        .online-file-item { 
            padding: 15px 20px; border-bottom: none; cursor: pointer; font-size: 15px; 
            color: var(--text-color); display: flex; align-items: center; justify-content: space-between; 
            transition: background 0.2s; 
        }
        .online-file-item:active { background: var(--border-color); }
        .file-info-left { display: flex; align-items: center; overflow: hidden; }
        .file-icon { margin-right: 12px; font-size: 1.1em; opacity: 0.8; flex-shrink: 0; }
        .file-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
        .version-tag {
            font-size: 0.8em; padding: 3px 8px; border-radius: 10px; background-color: var(--bg-color);
            color: var(--sub-text-color); font-weight: 800; font-family: Roboto, sans-serif;
            margin-left: 10px; flex-shrink: 0; border: 1px solid var(--border-color);
        }
        [data-theme="dark"] .version-tag { background-color: rgba(255,255,255,0.05); }
        .folder-group { border-bottom: none; }
        .folder-header { padding: 14px 20px; background: var(--card-bg); color: var(--text-color); cursor: pointer; font-weight: 600; font-size: 14px; display: flex; align-items: center; user-select: none; border-top: 1px solid var(--border-color); }
        .folder-header::before { content: '📂'; margin-right: 10px; font-weight: normal; font-size: 1.1em; }
        .folder-header.collapsed::before { content: '📁'; }
        .folder-items { overflow: hidden; max-height: 0; transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1); }
        .folder-items.hidden { max-height: 0; }
        .folder-items:not(.hidden) { max-height: 800px; }
        .folder-items .online-file-item { padding-left: 20px; background: var(--card-bg); }
        .drawer-section-title { padding: 10px 20px; padding-top: 15px; font-size: 13px; font-weight: 600; color: var(--sub-text-color); letter-spacing: 0.5px; background: var(--card-bg); opacity: 0.8; }

        /* 设置组件 */
        .settings-content { padding: 20px 20px; padding-top: 0px; }
        .setting-group { margin-bottom: 0px; }
        .setting-label { display: block; margin-top: 15px; margin-bottom: 15px; font-weight: 600; font-size: 14px; color: var(--sub-text-color); letter-spacing: 0.5px; }

        .mode-toggle-container { background-color: var(--toggle-bg-off); border-radius: 12px; padding: 4px; display: flex; position: relative; height: 44px; cursor: pointer; user-select: none; box-sizing: border-box; }
        .mode-glider { position: absolute; top: 4px; left: 4px; width: calc(50% - 4px); height: calc(100% - 8px); background-color: var(--card-bg); border-radius: 9px; transition: transform 0.3s cubic-bezier(0.2, 0, 0, 1); box-shadow: 0 2px 4px rgba(0,0,0,0.1); z-index: 1; }
        [data-theme="dark"] .mode-glider { background-color: #3D3D3D; }
        .mode-item { flex: 1; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 500; color: var(--sub-text-color); z-index: 2; transition: color 0.3s; position: relative; }
        .mode-item.active { color: var(--text-color); font-weight: 600; }
        /* 通用滑块逻辑，通过JS控制class实现位置切换 */
        .mode-toggle-container.toggled .mode-glider { transform: translateX(calc(100% + 0px)); margin-left: 4px; }
        /* 禁用状态 */
        .mode-item.disabled { opacity: 0.5; cursor: not-allowed; }

        .theme-options { display: flex; gap: 15px; justify-content: flex-start; }
        .theme-btn { width: 44px; height: 44px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; transition: all 0.2s; box-shadow: 0 2px 6px rgba(0,0,0,0.05); }
        .theme-btn:active { transform: scale(0.95); }
        .theme-auto { background: linear-gradient(135deg, #f3f4f6 50%, #374151 50%); border-color: #d1d5db; }
        .theme-light { background: #ffffff; border: 1px solid #e5e7eb; }
        .theme-dark { background: #374151; border: 1px solid #4b5563; }
        .theme-btn.active { border-color: var(--primary-color); box-shadow: 0 0 0 2px var(--card-bg), 0 0 0 4px var(--primary-color); transform: scale(1.1); }

        .toggle-row { display: flex; align-items: center; justify-content: space-between; padding: 5px 0; margin-top: 10px;
margin-bottom: 10px; }
        .toggle-info { display: flex; flex-direction: column; }
        .toggle-title { font-size: 15px; font-weight: 500; color: var(--text-color); }
        .toggle-status { font-size: 12px; color: var(--sub-text-color); margin-top: 4px; transition: color 0.3s; }
        .switch-checkbox { display: none; }
        .switch-label { display: block; width: 50px; height: 28px; background: var(--toggle-bg-off); border-radius: 50px; position: relative; cursor: pointer; transition: background 0.3s; }
        .switch-label::after { content: ""; position: absolute; top: 2px; left: 2px; width: 24px; height: 24px; background: white; border-radius: 50%; transition: transform 0.3s cubic-bezier(0.2, 0, 0, 1); box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
        .switch-checkbox:checked + .switch-label { background: var(--toggle-on-bg); }
        .switch-checkbox:checked + .switch-label::after { transform: translateX(22px); }

        .btn-reset { width: 100%; padding: 14px; background-color: var(--bg-color); color: var(--error-text); border: 1px solid var(--error-color); border-radius: 12px; cursor: pointer; font-size: 15px; font-weight: 500; transition: all 0.2s; display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 10px; }
        .btn-reset:active { background-color: var(--error-color); color: white; }

        /* --- 统计抽屉样式 --- */
        .stats-container { padding: 25px 20px; }
        .stats-card-row { display: flex; gap: 15px; margin-bottom: 20px; }
        .stats-card {
            flex: 1; background: var(--bg-color); border-radius: 16px; padding: 20px;
            display: flex; flex-direction: column; align-items: center; justify-content: center;
            box-shadow: inset 0 0 0 1px var(--border-color);
        }
        .stats-value { font-size: 28px; font-weight: 700; color: var(--text-color); margin-bottom: 4px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
        .stats-value.good { color: var(--success-pill); }
        .stats-value.bad { color: var(--error-pill); }
        .stats-label { font-size: 12px; color: var(--sub-text-color); font-weight: 500; }
        
        /* --- 主体卡片 --- */
        #file-input { display: none; }
        #app-container {
            position: absolute;
            top: calc(var(--header-height) + var(--safe-top));
            bottom: calc(var(--footer-height) + var(--safe-bottom));
            left: 0;
            right: 0;

            display: flex;
            justify-content: center;
            align-items: center;
            perspective: 1000px;
            width: 100%;
            overflow: hidden;
            padding: 10px 0;
        }
        .card {
            width: 92%; max-width: 500px; height: 95%; max-height: 95%;
            /*
            max-height: calc( 100vh - var(--header-height) - var(--footer-height) - 40px);
            */
            background: var(--card-bg); border-radius: 16px; box-shadow: 0 10px 25px var(--shadow-color);
            position: absolute; display: flex; flex-direction: column; 
            user-select: none; transform: translateX(0) rotate(0); opacity: 1;
            transition: transform 0.3s ease-out, opacity 0.3s ease-out, background-color 0.3s, width 0.3s, max-width 0.3s;
            overflow: hidden; backface-visibility: hidden; -webkit-backface-visibility: hidden; transform-style: preserve-3d;
        }
        .anim-leave-left { transform: translateX(-120%) rotate(-10deg) !important; opacity: 0; }
        .anim-prepare-right { transition: none !important; transform: translateX(120%) rotate(10deg) !important; opacity: 0; }
        .anim-leave-right { transform: translateX(120%) rotate(10deg) !important; opacity: 0; }
        .anim-prepare-left { transition: none !important; transform: translateX(-120%) rotate(-10deg) !important; opacity: 0; }
        @media (max-width: 600px) {
            .anim-leave-left { transform: translateX(-120%) rotate(0deg) !important; opacity: 0; }
            .anim-prepare-right { transition: none !important; transform: translateX(120%) rotate(10deg) !important; opacity: 0; }
            .anim-leave-right { transform: translateX(120%) rotate(0deg) !important; opacity: 0; }
            .anim-prepare-left { transition: none !important; transform: translateX(-120%) rotate(-10deg) !important; opacity: 0; }
            .card { width: 94%; }
        }
        .scroll-hidden { overflow-y: auto; scrollbar-width: none; -ms-overflow-style: none; }
        .scroll-hidden.is-overflowing { mask-image: linear-gradient(to bottom, black calc(100% - 30px), transparent 100%); -webkit-mask-image: linear-gradient(to bottom, black calc(100% - 30px), transparent 100%); }
        .tag-type { display: inline-block; font-size: 0.8em; padding: 3px 10px; background: var(--highlight-bg); color: var(--highlight-text); border-radius: 12px; margin-right: 0; vertical-align: middle; font-weight: 600; }
        
        .card-header-scroll { max-height: 40%; padding: 20px 25px; padding-bottom: 10px; padding-top: 13px; margin-top: 3px; flex-shrink: 0; width: 100%; box-sizing: border-box; }
        .card-header-text { font-size: 1.1em; font-weight: bold; line-height: 1.6; color: var(--text-color); text-align: left; word-wrap: break-word; overflow-wrap: anywhere; }
        .question-meta-row { text-align: center; margin-bottom: 13px; }

        .card-body-scroll { flex: 1; padding: 10px 20px 0 20px; padding-top: 5px; display: flex; flex-direction: column; width: 100%; overflow-y: auto; scrollbar-width: none; -ms-overflow-style: none; position: relative;}
        .card-body-content { padding-bottom: 20px; }
        
        .options-list { list-style: none; padding: 0; margin: 0; width: 100%; }
        .option-item { padding: 12px 15px; border: 1px solid var(--border-color); margin-bottom: 10px; border-radius: 8px; cursor: pointer; transition: all 0.2s; display: flex; align-items: flex-start; color: var(--text-color); background: var(--card-bg); line-height: 1.4; }
        .option-key { margin-right: 10px; font-weight: bold; flex-shrink: 0; margin-top: 0; }
        .option-content-scroll { flex: 1; word-wrap: break-word; overflow-wrap: anywhere; padding-bottom: 0; }
        .option-item:active { transform: scale(0.99); }
        .option-item.selected { border-color: var(--primary-color); background-color: var(--highlight-bg); color: var(--highlight-text); }
        .option-item.correct { background-color: var(--success-color); color: var(--success-text); border-color: var(--success-color); font-weight: bold; }
        .option-item.wrong { background-color: var(--error-color); color: var(--error-text); border-color: var(--error-color); }
        .option-item.partial { background-color: var(--partial-bg); color: var(--partial-text); border-color: var(--partial-bg); font-weight: bold; }
        
        /* --- 填空题样式 (iOS Safari 修复版) --- */
        .fill-input-container { width: 100%; margin-top: 10px; }
        .fill-input { 
            width: 100%; padding: 12px; font-size: 16px; 
            border: 2px solid var(--border-color); border-radius: 8px; 
            margin-bottom: 15px; box-sizing: border-box; outline: none; 
            background: var(--card-bg); color: var(--text-color); 
            transition: border-color 0.2s; 
            appearance: none; -webkit-appearance: none; opacity: 1; 
        }
        .fill-input:disabled { opacity: 1 !important; -webkit-text-fill-color: var(--text-color); background-color: var(--card-bg); color: var(--text-color); }
        .fill-input:focus { border-color: var(--primary-color); }
        .fill-input.correct { border-color: var(--success-color); background: var(--success-color); color: var(--success-text); }
        .fill-input.correct:disabled { background-color: var(--success-color) !important; color: var(--success-text) !important; -webkit-text-fill-color: var(--success-text) !important; border-color: var(--success-color) !important; opacity: 1 !important; }
        .fill-input.wrong { border-color: var(--error-color); background: var(--error-color); }
        .fill-input.wrong:disabled { background-color: var(--error-color) !important; border-color: var(--error-color) !important; opacity: 1 !important; color: var(--text-color) !important; -webkit-text-fill-color: var(--text-color) !important; }
        
        .btn-submit { background-color: var(--primary-color); color: white; border: none; padding: 12px 20px; border-radius: 8px; font-size: 16px; width: 100%; cursor: pointer; margin-top: 10px; margin-bottom: 10px; transition: opacity 0.2s; flex-shrink: 0; }
        .btn-submit:hover { opacity: 0.9; }
        .btn-submit:disabled { background-color: var(--border-color); cursor: not-allowed; }

        .explanation-container {
            margin-top: 20px; padding: 15px; background-color: var(--exp-bg); border: 1px solid var(--exp-border);
            border-radius: 12px; font-size: 14px; line-height: 1.6; color: var(--sub-text-color); animation: fadeIn 0.4s ease-out;
        }
        body.no-anim .explanation-container { animation: none; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
        
        .explanation-header { display: flex; align-items: center; gap: 8px; font-weight: 600; color: var(--exp-title); margin-bottom: 8px; font-size: 14px; }
        .explanation-text { word-wrap: break-word; overflow-wrap: anywhere; }

        .result-container { text-align: center; display: flex; flex-direction: column; justify-content: center; height: 100%; align-items: center; padding: 20px; }
        .score-circle { width: 120px; height: 120px; border-radius: 50%; background: conic-gradient(var(--primary-color) 0%, var(--border-color) 0%); display: flex; justify-content: center; align-items: center; margin-bottom: 20px; position: relative; flex-shrink: 0; }
        .score-inner { width: 100px; height: 100px; background: var(--card-bg); border-radius: 50%; display: flex; flex-direction: column; justify-content: center; align-items: center; }
        .score-num { font-size: 24px; font-weight: bold; color: var(--primary-color); }
        .score-label { font-size: 12px; color: var(--text-color); opacity: 0.7; }
        .result-stats { margin-bottom: 30px; color: var(--text-color); font-size: 16px; }
        .btn-restart { background: var(--primary-color); color: white; padding: 12px 30px; border-radius: 25px; border: none; font-size: 16px; cursor: pointer; box-shadow: 0 4px 10px var(--shadow-color); transition: transform 0.2s, opacity 0.2s; }
        .btn-restart:active { transform: scale(0.95); }
        
        /* Readme Hint Animation - Revised (Fix 1) */
        .readme-hint {
            font-size: 13px; color: var(--primary-color); margin-top: 30px; 
            display: flex; align-items: center; gap: 8px;
            opacity: 0; transition: opacity 0.5s;
        }
        .readme-hint.visible { opacity: 1; }
        
        /* Shimmer Effect for Hint */
        .shimmer-text {
            background: linear-gradient(to left, var(--text-color) 20%, var(--primary-color) 50%, var(--text-color) 80%);
            background-size: 200% auto;
            color: transparent;
            -webkit-background-clip: text;
            background-clip: text;
            animation: shine 3s linear infinite;
            font-weight: 600;
        }
        @keyframes shine {
            to { background-position: -200% center; }
        }

        /* Markdown Reader Styles */
        .markdown-content {
            padding: 0px; line-height: 1.7; 
            font-size: calc(var(--base-font-size) * var(--font-scale)); 
            color: var(--text-color);
            text-align: left; user-select: text;
            max-width: 1000px; /* 限制阅读宽度，优化大屏体验 */
            width: 100%; /* 确保填满父容器 */
            margin: 0 auto;   /* 居中显示 */
            
            /* 强制移动端换行，修复长文本溢出问题 */
            overflow-wrap: anywhere; 
            word-break: break-word;
            word-wrap: break-word;
            box-sizing: border-box; /* 确保padding计算在内 */
        }
        
        /* 强制所有文本子元素也应用换行规则 */
        .markdown-content * {
            overflow-wrap: anywhere;
            word-break: break-word;
            box-sizing: border-box;
        }
        
        .markdown-content h1, .markdown-content h2, .markdown-content h3 { color: var(--text-color); margin-top: 1.5em; margin-bottom: 0.5em; font-weight: 700; line-height: 1.3; }
        .markdown-content h1 { font-size: 1.6em; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; }
        .markdown-content h2 { font-size: 1.4em; }
        .markdown-content p { margin-bottom: 1em; white-space: normal; /* 强制段落换行 */ }
        .markdown-content ul, .markdown-content ol { padding-left: 20px; margin-bottom: 1em; }
        .markdown-content li { margin-bottom: 0.5em; white-space: normal; }
        .markdown-content code { background: var(--bg-color); padding: 2px 4px; border-radius: 4px; font-family: monospace; font-size: 0.9em; word-break: break-all;}
        
        /* Mobile-friendly table and code blocks */
        .markdown-content pre { 
            background: var(--bg-color); padding: 10px; border-radius: 8px; 
            overflow-x: auto; margin-bottom: 1em; 
            white-space: pre; 
            max-width: 100%;
        }
        .markdown-content pre code { background: none; padding: 0; word-break: normal; overflow-wrap: normal; white-space: pre; }
        .markdown-content blockquote { border-left: 4px solid var(--primary-color); margin: 0; padding-left: 15px; color: var(--sub-text-color); margin-bottom: 1em; }
        
        /* 修复表格：纯 CSS 实现移动端横向滚动，不依赖 marked 自定义渲染器 */
        .markdown-content table { 
            border-collapse: collapse; 
            width: 100%; 
            display: block; /* 关键：变为块级以支持 overflow */
            overflow-x: auto; /* 允许横向滚动 */
            -webkit-overflow-scrolling: touch;
            margin-bottom: 1em;
            max-width: 100%;
        }
        /* Fix 2: Explicitly set font size for table cells to inherit the scale variable */
        .markdown-content th, .markdown-content td { 
            border: 1px solid var(--border-color); padding: 8px; text-align: left; white-space: nowrap; 
            font-size: calc(var(--base-font-size) * var(--font-scale)); /* Fix 2 */
        }
        .markdown-content th { background-color: var(--bg-color); font-weight: 600; }
        
        /* 针对大屏幕表格不需要滚动时的优化（可选，保持 nowrap 可确保对齐） */
        @media (min-width: 768px) {
             .markdown-content table { display: table; }
             .markdown-content th, .markdown-content td { white-space: normal; }
        }

        .markdown-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 10px 0; }
        
        /* Search UI Styles (修复动效问题 1) */
        .search-bar-overlay {
            position: absolute; top: 0; left: 0; right: 0;
            background: var(--card-bg); padding: 10px;
            border-bottom: 1px solid var(--border-color);
            display: flex; gap: 8px; align-items: center;
            z-index: 50; 
            
            /* 默认状态：向上隐藏，透明度为0 */
            transform: translateY(-100%);
            opacity: 0;
            pointer-events: none;
            
            /* 在基础类定义 transition，确保显示和隐藏都有动画 */
            transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), opacity 0.3s ease;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }
        
        .search-bar-overlay.visible { 
            /* 激活状态：回到原位，完全不透明 */
            transform: translateY(0); 
            opacity: 1; 
            pointer-events: auto; 
        }
        
        .search-input-group {
            flex: 1; display: flex; align-items: center; position: relative;
        }
        .search-input {
            width: 100%; padding: 8px 12px; border-radius: 6px;
            border: 1px solid var(--border-color); background: var(--bg-color);
            color: var(--text-color); outline: none; font-size: 14px;
        }
        .search-input:focus { border-color: var(--primary-color); }
        .search-count {
            position: absolute; right: 8px; font-size: 12px; color: var(--sub-text-color);
            pointer-events: none;
        }
        
        .search-actions { display: flex; gap: 4px; }
        .search-btn {
            background: none; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center;
            color: var(--sub-text-color); padding: 6px; border-radius: 4px; transition: background 0.2s;
            width: 32px; height: 32px;
        }
        .search-btn:hover { background: var(--bg-color); color: var(--text-color); }
        .search-btn:active { background: var(--border-color); }
        .search-btn:disabled { opacity: 0.3; cursor: default; }
        
        mark.search-match { background-color: var(--search-match-bg); color: var(--search-match-text); padding: 2px 0; border-radius: 2px; }
        mark.search-match.active { background-color: var(--search-active-bg); color: var(--search-active-text); }
        
        /* 3. Font Settings Popup Styles (修复动效问题 2) */
        .font-settings-overlay {
            position: absolute; 
            bottom: 60px; /* 位于Footer上方 */
            right: 5px; 
            background: var(--card-bg);
            padding: 15px; border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.15);
            border: 1px solid var(--border-color);
            display: flex; align-items: center; gap: 10px;
            z-index: 150;
            width: 240px;
            
            /* 默认状态：向下偏移并缩小，透明度为0 */
            transform: translateY(5px) scale(1);
            opacity: 0;
            pointer-events: none;
            
            /* 在基础类定义 transition，确保显示和隐藏都有动画 */
            transition: transform 0.25s cubic-bezier(0.25, 0.8, 0.25, 1), opacity 0.25s ease;
        }
        
        .font-settings-overlay.visible { 
            /* 激活状态：回到原位，正常大小，完全不透明 */
            transform: translateY(0) scale(1);
            opacity: 1; 
            pointer-events: auto; 
            right: 5px;
            bottom: 60px;

        }
        
        /* Arrow for popup */
        .font-settings-overlay::after {
            content: ''; position: absolute; bottom: -6px; right: 25px;
            width: 10px; height: 10px; background: var(--card-bg);
            border-bottom: 1px solid var(--border-color); border-right: 1px solid var(--border-color);
            transform: rotate(45deg);
        }

        .font-slider-container { flex: 1; display: flex; align-items: center; gap: 8px; position: relative; }
        .font-icon-small { font-size: 12px; color: var(--sub-text-color); font-weight: bold; }
        .font-icon-large { font-size: 20px; color: var(--text-color); font-weight: bold; }
        
        .font-range-input {
            -webkit-appearance: none; width: 100%; height: 4px; border-radius: 2px; background: var(--border-color);
            outline: none; position: relative; z-index: 2;
        }
        .font-range-input::-webkit-slider-thumb {
            -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
            background: var(--card-bg); border: 2px solid var(--primary-color);
            cursor: pointer; box-shadow: 0 1px 3px rgba(0,0,0,0.2);
            transition: transform 0.1s;
        }
        .font-range-input::-webkit-slider-thumb:active { transform: scale(1.1); }
        
        /* 0 Mark for Slider */
        .slider-mark-center {
            position: absolute; left: 47.75%; top: 50%; transform: translate(-50%, -50%);
            width: 2px; height: 10px; background-color: var(--sub-text-color);
            opacity: 0.3; z-index: 1; pointer-events: none;
        }

        /* 2. Custom Scrollbar Styles (Fix 3: Rotary Preview) */
        .custom-scrollbar-container {
            position: absolute; right: 4px; top: 10px; bottom: 10px; width: 14px;
            z-index: 60; display: none; flex-direction: column; align-items: center;
        }
        .reader-mode .custom-scrollbar-container { display: flex; }
        
        .custom-scrollbar-track {
            position: relative; width: 2px; height: 100%; background: var(--border-color); border-radius: 2px;
        }
        
        .scroll-marker {
            position: absolute; left: 50%; transform: translateX(-50%) translateY(-50%);
            width: 8px; height: 8px; border-radius: 50%;
            background-color: var(--border-color); border: 2px solid var(--card-bg);
            cursor: pointer; z-index: 2; transition: all 0.2s;
        }
        .scroll-marker:hover { width: 10px; height: 10px; background-color: var(--primary-color); }
        .scroll-marker.active { background-color: var(--primary-color); width: 10px; height: 10px; }
        
        .scroll-thumb {
            position: absolute; left: 50%; transform: translateX(-50%);
            width: 6px; height: 30px; background-color: var(--sub-text-color);
            border-radius: 4px; cursor: grab; z-index: 3; opacity: 0.5;
            transition: opacity 0.2s, background-color 0.2s;
        }
        .scroll-thumb:hover, .scroll-thumb.dragging { opacity: 0.9; width: 10px; }
        .scroll-thumb:active { cursor: grabbing; }

        /* --- Scroll Preview Wheel (Task 3) --- */
        .scroll-preview-box {
            position: absolute; 
            right: 25px; top: 0; /* Updated via JS */
            width: 200px; height: 60px;
            pointer-events: none;
            opacity: 0; transform: scale(0.9);
            transition: opacity 0.2s, transform 0.2s;
            display: flex; align-items: center; justify-content: flex-end;
            z-index: 70;
            perspective: 500px;
        }
        .scroll-preview-box.visible { opacity: 1; transform: scale(1); }
        
        .scroll-preview-wheel {
            position: relative; width: 100%; height: 100%;
            transform-style: preserve-3d;
        }
        
        .preview-item {
            position: absolute; right: 0; width: 100%; height: 20px;
            text-align: right;
            font-size: 12px; color: var(--sub-text-color);
            white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
            transform-origin: center right;
            backface-visibility: hidden;
            transition: transform 0.2s ease-out, opacity 0.2s ease-out;
            display: flex; align-items: center; justify-content: flex-end;
        }
        
        .preview-item.prev { top: 0; opacity: 0.4; transform: translateY(-5px) rotateX(25deg) scale(0.9); }
        .preview-item.curr { top: 20px; opacity: 1; color: var(--text-color); font-weight: bold; transform: translateY(0) rotateX(0) scale(1.05); text-shadow: 0 1px 5px var(--card-bg); }
        .preview-item.next { top: 40px; opacity: 0.4; transform: translateY(5px) rotateX(-25deg) scale(0.9); }
        
        .preview-text-bg { background: var(--card-bg); padding: 2px 6px; border-radius: 4px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); border: 1px solid var(--border-color); max-width: 100%; overflow: hidden; text-overflow: ellipsis; }


        /* Reader Mode Enhancements */
        body.reader-mode .card {
            max-width: 96%;
            width: 96%;
            height: 94%;
            max-height: 94vh;
            /* Give space for scrollbar on mobile */
            padding-right: 0px; 
        }
        @media (min-width: 1600px) {
            body.reader-mode .card {
                max-width: 1500px;
            }
        }
        /* Mobile specific reader fixes */
        @media (max-width: 600px) {
            /* 修复：缩小手机端阅读卡片宽度，增加留白，防止视感过于拥挤 */
            body.reader-mode .card { 
                width: 92%; max-width: 92%; 
                padding-right: 0; padding-bottom: 20px; 
                overflow: hidden; /* 修复问题3：卡片内部防溢出 */
            }
            .card-body-scroll {
            overflow-x: hidden; /* 修复问题3：滚动区域防横向溢出 */
            scroll-behavior: auto !important; /* 禁止字体变化时的滚动动画 */
        }
            .markdown-content { 
                /* 修复字体调节失效：使用变量计算，而不是强制覆盖 */
                font-size: calc(14px * var(--font-scale)); 
                padding: 0 4px; 
            }
            .custom-scrollbar-container { width: 8px; right: 2px; }
            .scroll-marker { width: 4px; height: 4px; border: 0; } /* Smaller markers on mobile */
            .scroll-thumb { width: 4px; }
            .scroll-preview-box { width: 160px; right: 15px; } /* Mobile adjust */
        }
        
        /* Disable non-functional settings in Reader Mode */
        body.reader-mode .quiz-only {
            display: none !important;
        }

        /* --- Footer Styles (Aligned with Header) --- */
        footer {
            position: fixed;
            left: 0;
            right: 0;
            bottom: 0;

            height: calc(var(--footer-height) + var(--safe-bottom));
            padding: 0 15px;
            padding-bottom: var(--safe-bottom);

            background: var(--bg-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            flex-shrink: 0;

            z-index: 85;
        }
        
        /* Footer buttons to match Header .icon-btn size/positioning */
        .nav-btn {
            background: none; border: none; font-size: 1.5em; cursor: pointer; color: var(--primary-color);
            width: 40px; height: 40px; /* Fixed size to match header icon-btn */
            padding: 0;
            display: flex; align-items: center; justify-content: center;
            transition: opacity 0.2s;
        }
        .nav-btn:disabled { color: var(--border-color); cursor: default; }
        
        /* Progress Text centered absolutely like Header Title */
        #progress-text {
            position: absolute; left: 50%; top: calc(var(--footer-height) / 2); transform: translate(-50%, -50%);
            background: none; border: none; font-size: 1rem; color: var(--text-color); font-family: inherit;
            cursor: pointer; padding: 10px 20px; border-radius: 8px; transition: background 0.2s; user-select: none;
            max-width: 60%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
        }
        #progress-text:active { background: var(--border-color); }
        
        /* 模态框 */
        #reset-modal, #mode-switch-modal, #study-switch-modal, #restore-modal, #version-modal, #reset-stats-modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 200; justify-content: center; align-items: center; }
        .modal-content { background: var(--card-bg); padding: 25px; border-radius: 12px; width: 280px; box-shadow: 0 10px 30px rgba(0,0,0,0.2); transition: background-color 0.3s; }
        .modal-title { font-size: 18px; font-weight: bold; margin-bottom: 15px; color: var(--text-color); }
        .modal-text { color: var(--text-color); margin-bottom: 20px; font-size: 14px; }
        .modal-buttons { display: flex; gap: 10px; }
        .modal-btn { flex: 1; padding: 10px; border: none; border-radius: 6px; cursor: pointer; font-size: 14px; transition: all 0.2s; text-align: center; }
        .modal-btn:active { transform: scale(0.95); }
        .modal-btn-confirm { background-color: var(--primary-color); color: white; }
        .modal-btn-danger { background-color: #ef4444; color: white; }
        .modal-btn-cancel { background-color: var(--bg-color); color: var(--text-color); border: 1px solid var(--border-color); }
        
        .online-loading { padding: 20px; text-align: center; color: #999; font-size: 13px; }
        
        #app-container.keyboard-open .card { transform: translateY(-20px) !important; }
        .hidden { display: none !important; }
        
        .currency-symbol::after {content: "$";}

        html.is-wechat footer {
         /* 强制底部留白为 10px (你可以改为 0px 如果想完全贴底) */
          padding-bottom: 0px !important; 
    
          /* 重新计算高度：固定高度 60px/70px + 留白 10px */
          /* 注意：这里不使用 --safe-bottom 变量，而是直接写死数值，防止变量未生效 */
         /* height: calc(var(--footer-height) + 0px) !important; */
          height: 70px !important; 
        }

        /* 2. 修正中间卡片容器的底部距离，防止被 Footer 遮挡 */
        html.is-wechat #app-container {
            /* 保持与 Footer 高度一致 */
            /* bottom: calc(var(--footer-height) + 0px) !important; */
            bottom: 70px !important;
        }
        
        .mermaid {
        background: var(--bg-color); /* 适配背景色 */
        padding: 10px;
        margin-bottom: 1em;
        border-radius: 8px;
        
        /* 核心：移动端横向滚动支持 */
        display: flex;
        justify-content: center; /* 图表较小时居中 */
        overflow-x: auto;        /* 图表较大时滚动 */
        -webkit-overflow-scrolling: touch; /* iOS 顺滑滚动 */
        
        border: 1px solid var(--border-color); /* 可选：增加边框提升视觉区分 */
        }

        /* 修复 Mermaid SVG 默认宽度问题，确保它能撑开容器 */
        .mermaid svg {
            max-width: none !important; /* 禁止 SVG 自动缩放，强制触发滚动 */
            height: auto;
        }

        /* 深色模式下的微调（如果 Mermaid 的 dark 主题不够完美） */
        [data-theme="dark"] .mermaid {
            background: rgba(255, 255, 255, 0.02);
        }

        /* --- Obsidian Callout 样式支持 --- */

        /* 1. 基础容器 */
        .obsidian-callout {
            margin: 1em 0;
            padding: 0;
            border-radius: 8px;
            border: 1px solid rgba(0,0,0,0.1);
            border-left-width: 5px; /* 左侧颜色条 */
            background-color: var(--callout-bg);
            overflow: hidden;
        }

        /* 2. 标题栏 */
        .callout-title {
            padding: 10px 15px;
            font-weight: 700;
            font-size: 15px;
            color: var(--callout-color);
            background-color: rgba(0,0,0,0.03); /* 标题栏微深一点 */
            display: flex;
            align-items: center;
        }

        /* 3. 内容区 */
        .callout-body {
            padding: 10px 15px;
            color: var(--text-color);
            opacity: 0.9;
        }
        .callout-body p:last-child { margin-bottom: 0; }
        .callout-body p:first-child { margin-top: 0; }

        /* 4. 类型定义 (颜色变量) */
        /* 默认/Note/Info - 蓝色 */
        .callout-note, .callout-info, .callout-todo {
            --callout-color: #3b82f6;
            --callout-bg: rgba(59, 130, 246, 0.1);
            border-left-color: #3b82f6;
        }

        /* Success/Done - 绿色 */
        .callout-success, .callout-done, .callout-check {
            --callout-color: #10b981;
            --callout-bg: rgba(16, 185, 129, 0.1);
            border-left-color: #10b981;
        }

        /* Warning/Caution/Attention - 橙/黄色 */
        .callout-warning, .callout-caution, .callout-attention {
            --callout-color: #f59e0b;
            --callout-bg: rgba(245, 158, 11, 0.1);
            border-left-color: #f59e0b;
        }

        /* Error/Danger/Failure/Missing - 红色 */
        .callout-error, .callout-danger, .callout-failure, .callout-missing, .callout-bug {
            --callout-color: #ef4444;
            --callout-bg: rgba(239, 68, 68, 0.1);
            border-left-color: #ef4444;
        }

        /* Tip/Hint/Important - 青色 */
        .callout-tip, .callout-hint, .callout-important {
            --callout-color: #06b6d4;
            --callout-bg: rgba(6, 182, 212, 0.1);
            border-left-color: #06b6d4;
        }

        /* Example/Question - 紫色 */
        .callout-example, .callout-question {
            --callout-color: #8b5cf6;
            --callout-bg: rgba(139, 92, 246, 0.1);
            border-left-color: #8b5cf6;
        }

        /* Quote/Cite - 灰色 */
        .callout-quote, .callout-cite {
            --callout-color: #64748b;
            --callout-bg: rgba(100, 116, 139, 0.1);
            border-left-color: #64748b;
        }

        /* 深色模式适配 (增强背景可见度) */
        [data-theme="dark"] .obsidian-callout {
            border: 1px solid rgba(255,255,255,0.1);
            /* 背景色透明度稍微调高一点，或者保持不变，因为是基于rgba的 */
        }

        /* 针对标题颜色的特殊处理：深色模式下稍微亮一点 */
        [data-theme="dark"] .callout-title {
            background-color: rgba(255,255,255,0.05);
        }
        /* --- 题目卡片内的 Markdown 样式支持 --- */
        /* 1. 题干区域的 Markdown 调整 */
        .card-header-text p {
            margin: 0 0 10px 0; /* 修正 marked 生成的 p 标签间距 */
            display: inline-block; /* 尽量保持紧凑 */
            width: 100%;
        }
        .card-header-text p:last-child {
            margin-bottom: 0;
        }

        /* 2. 解析区域的 Markdown 调整 */
        .explanation-text p {
            margin: 0 0 0.8em 0;
        }

        /* 3. 通用表格样式 (支持题干和解析中的表格) */
        .card-header-text table,
        .explanation-text table {
            border-collapse: collapse;
            width: 100%;
            display: block;      /* 关键：块级显示以支持 overflow */
            overflow-x: auto;    /* 关键：横向滚动 */
            -webkit-overflow-scrolling: touch;
            margin-top: 10px;
            margin-bottom: 10px;
            background: var(--bg-color); /* 表格背景微调 */
            border-radius: 6px;
        }

        .card-header-text th, .card-header-text td,
        .explanation-text th, .explanation-text td {
            border: 1px solid var(--border-color);
            padding: 6px 10px;
            text-align: left;
            font-size: 0.9em;
            white-space: nowrap; /* 防止内容自动换行挤压 */
        }

        .card-header-text th,
        .explanation-text th {
            background-color: rgba(0,0,0,0.05);
            font-weight: 600;
        }

        /* 深色模式适配 */
        [data-theme="dark"] .card-header-text th,
        [data-theme="dark"] .explanation-text th {
            background-color: rgba(255,255,255,0.1);
        }

        /* 4. 代码块样式支持 */
        .explanation-text pre,
        .card-header-text pre {
            background: rgba(0,0,0,0.05);
            padding: 8px;
            border-radius: 4px;
            overflow-x: auto;
            font-family: monospace;
            font-size: 0.9em;
        }
        [data-theme="dark"] .explanation-text pre,
        [data-theme="dark"] .card-header-text pre {
            background: rgba(255,255,255,0.1);
        }
        /* --- Markdown 内容增强样式 --- */
        /* 1. 表格滚动包裹层 (由 JS 动态添加) */
        .table-responsive-wrapper {
            width: 100%;
            overflow-x: auto;          /* 负责横向滚动 */
            -webkit-overflow-scrolling: touch;
            margin: 10px 0;
            border: 1px solid var(--border-color);
            border-radius: 8px;        /* 圆角包裹 */
            background: var(--bg-color);
        }

        /* 2. 表格本体样式 */
        .markdown-body table {
            width: 100%;               /* 关键：强制表格撑满容器宽度 */
            border-collapse: collapse;
            display: table;            /* 恢复为表格布局，确保自动拉伸 */
            margin: 0;                 /* 边距交由 wrapper 控制 */
            border: none;              /* 边框交由 wrapper 控制 */
        }

        /* 3. 单元格样式 - 调整字体大小 */
        .markdown-body th, 
        .markdown-body td {
            padding: 10px 12px;
            border: 1px solid var(--border-color);
            text-align: center;
            white-space: nowrap;
            font-size: 0.95em; /* 【修改】直接指定像素大小，避免 0.9em 过小 */
            line-height: 1.5;
        }

        /* 【新增】强制内容区域为正常粗细 */
        .markdown-body td {
            font-weight: normal !important;
            color: var(--text-color);
            opacity: 0.9; /* 让内容稍微淡一点点，增加层次感 */
        }

        /* 5. 表头样式 - 加粗并加深颜色 */
        .markdown-body th {
            background-color: rgba(0,0,0,0.04); /* 背景稍深一点 */
            font-weight: normal !important; /* 【修改】恢复标准粗体，确保比内容粗 */
            color: var(--text-color);     /* 颜色保持深色 */
        }

        /* 深色模式适配保持不变，或者微调背景 */
        [data-theme="dark"] .markdown-body th {
            background-color: rgba(255,255,255,0.08);
        }
        /* --- 选项区域 Markdown 适配 --- */
        .option-content-scroll.markdown-body {
            background: transparent;
            font-size: inherit;
            padding: 0;
            margin-bottom: 0px; /* 微调垂直对齐 */
            padding-bottom: 0px;
        }

        /* 消除选项内 Markdown 段落的默认间距，使其紧凑 */
        .option-content-scroll.markdown-body p {
            margin: 0;
            display: inline-block; /* 保持行内显示体验 */
        }

        /* 选项中的图片限制 */
        .option-content-scroll.markdown-body img {
            max-width: 100%;
            max-height: 100px; /* 防止选项图片过大 */
            vertical-align: middle;
            margin: 5px 0;
        }

        /* --- 题目列表区域 Markdown 适配 --- */
        .q-item-content {
            align-items: center; /* 顶部对齐，防止多行标题导致序号居中 */
            padding-left: 10px;      /* 调整原有内边距 */
        }

        .q-list-num {
            font-weight: bold;
            margin-right: 8px;
            flex-shrink: 0;
            color: var(--text-color);
        }

        .q-text.markdown-body {
            font-family: inherit;
            font-size: 15px;
            color: var(--text-color);
            background: transparent;
            padding: 0;
            
            /* 核心：限制显示行数，防止列表过长 */
            display: -webkit-box;
            -webkit-line-clamp: 2; /* 最多显示2行 */
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: normal; /* 允许换行 */
            line-height: 1.4;
        }

        /* 强制列表内的 Markdown 元素紧凑显示 */
        .q-text.markdown-body p {
            margin: 0;
            display: inline; /* 强制段落行内显示 */
        }

        /* 列表内隐藏过于复杂的元素，保持列表整洁 */
        .q-text.markdown-body table,
        .q-text.markdown-body pre,
        .q-text.markdown-body blockquote,
        .q-text.markdown-body ul,
        .q-text.markdown-body ol,
        .q-text.markdown-body img {
            display: none; /* 列表预览时不显示复杂块元素 */
        }